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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0234a372d8215cc062ec866db88b023fa790f9f2d2365262d51e865d245efd5c' 
  AND token = 'xHM7EwfcENeeADsP8OYEZchuMSEcGz29QIIYZ/IjU6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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