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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0940763266e68f9c0fb194f1ed0bdc86a923de99573a570e27fef7db64113f5' 
  AND token = 'CVbd6EdbwNz1xhwL/qkTjFTPT1EWM+smiRTrTIPjDVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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