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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb6fbe6902b05ced23952ca3e2a9b407541bfdb573a6981ccf2948924f4b543' 
  AND token = 'ddh+6A6CLgGPEJQ/cWRXnC7tm6hCTPfDjblTWGnW+so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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