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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c9b32ac1c7359e6e3db71e148e65b270ae40743e15b12efd58d85681712c17' 
  AND token = 'kiSDMZJ1nunQupLFvyASJTFZuh79AG18z+ooxn3nlr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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