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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2ab5b02df6b0e8d8261bdbe37baaf8614e36259bf6d4e97395efb8d88ba6ee7' 
  AND token = 'kioMI2E3HxGJ9HdaRWixoXZXjv15XgUPXLmJwaRNroU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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