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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf84c5aaf26d51e36d9237fcf094da0b060db47727bd0297196ab87ae99efb33' 
  AND token = 'FqcdN8j1jkvT+bSk0Q4SJYhQ5kkC29e2dq2R2Q/mIEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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