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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6cfece53aa9d7b46db87c0940b7d63461abaa54bd3f277920e6591d9b1d813' 
  AND token = 'qfyIjDLssIeEh7LbQz+aeTP1cEpR4Cz8mvY8cFQaZEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}