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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a41545f96d108f7a6b60e578e34899361ab34e7d2b5f3b709f339a03eafd0a' 
  AND token = 'qiuh4o8leTBlrmt5aOJGBkgg7l/XqdcODfTPcYCNW9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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