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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b681e406b54bee9a4e3049b49c6f591ce17a8ac39a841d84b45dd0dde75f66a' 
  AND token = '842qlGGCeFAItBWT/r2oVPln8mm2cGR/ejeNqYn3Jz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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