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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787290a955c35d07f2c25b446233ecd6f2f97cbb532aa0e4602c0ca0f683c8c1' 
  AND token = '5n+kcEUBYzKZUO140hm1GOJuM8RuMSeSY2NIoAEENWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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