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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1968a6f10ae621967fefbfdc2663528905ecf21282ffb69eb94d55bbab2113f4' 
  AND token = '9G46n+Bj8lRK1IZnZjob/Zdzt+jwEOkRULRq5siUW68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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