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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4ff7bffd8a77ac8a6ea373cdc51c2dad76129e370ca64bbbcb36e2c2176c22' 
  AND token = '3ghiqHUU3iuqUyjV9R3L4Dmp39kwSrXtWFEmZjuqp+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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