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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a171be4963601650a309bc114827994c9cd07f7028b999d6802278d575d5e386' 
  AND token = 'PlOcX5FpVHC52xewLq/2y0H/6XHVd9oX4tartSKeZVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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