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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d59263432fb215f3b043192e6909d13bf4cdd958a70ed1ce0dad404b71e21ef' 
  AND token = '9oUG3ZwTQo7Mc5xvJaTpuyN+3DQcKP3efWfngQ5u5to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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