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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddbb55b8a017bdd04f2e9b4fe2d74861a2415a46210a8931ddf57fae8ba8233' 
  AND token = 'eC/fxsv/FV0fxCs9QjMNBOaQ7p5jwIcMI/ERbBu3odc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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