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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f6307181991d710f3b56511f952f8edd36ebfddc0f2222bcc39450b2b25a0f7' 
  AND token = '5xY7BJPE7B3RNJvoKDrpWH+bS4EDx3AGaxlM8yfz+RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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