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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f0bd126f829d9f5337a7453e4eee718a12a229a853dd7773d5b36f069b67b33' 
  AND token = 'IdOsffzdL9iaCGUeYmp9ky+IlWwzHwofett1ic8kkpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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