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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119993a7c74244ce27e0621a399e471589b9978da5d79573688978a1ae6d9c84' 
  AND token = '0O3nomlXLaYpvBd+3X6Dnt0XGGcFYPJkuY6gIgkYSSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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