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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6b11397c315a5fbab518ad3a8925c822492b310d382c5f06ff9547908dcdef' 
  AND token = 'lQSh3Sm07CvO7Nn8rvqsO1ZM9EOVfANHxz27+s9TPlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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