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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9ae3580e7bb69a036c8e2598bd77810f2cdf128239d58c9a985aca2c197dc9' 
  AND token = 'faUeA9d8hrWQsb8ttWSFpGRUW3O8fxsDxnuAj1/6vdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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