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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '143e4f851f0aa7ec5b18f4841ddb6cb28614ea809d6deba1d49db69f1292f7ba' 
  AND token = 'd+abLf373kVSgYclb0URfwdY1aiVCk19hzC8HBXjOrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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