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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8604cc42510e7af6bd1a2db56053beea76a87d9082ae4ff7985c6ac464e4f1ee' 
  AND token = 'vOW0/MJzkTxagJ0+Nm/QcZCjS0fyK0s/kd7YkNon20Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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