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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b844ddb276abcd67a3f0bae436e00175828eeb84244e836f73ac3f72d9ed4f88' 
  AND token = '35nhTbYcs+lTzQg4ZU7ozHwy2SpL7xOnLzRJCGn+m6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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