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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb2663ee5226b280c25bfeeaf70657e94ce64bd7ac4cae6d55a04d1f6801362' 
  AND token = 'YROxGKOE10t+MBn7FBPXlZ9xUA10c5MUif49tbjBXiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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