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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04487d3bc8e99516ce862b46b96902d7fa7b6e6c364511ed10bee62a443b645' 
  AND token = '2BwRqunP8tM3Z4ZaFE7L8/lm07izcMs/0lxhDdkQXqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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