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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099204526d9d3d9c76ec8d659e032fc663cdf5a4097361e68202cab27ccfa52e' 
  AND token = '6/bmXb6b8RxzZ0uGU6+yqvsqShQtyhTF7U76IUuQVHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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