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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204b2ffe9bfecd5b093348f8800064047ddd53d6ba099d6ce1a80488695ba9be' 
  AND token = 'ged2rdOv2PJTsVJ1sUtDhEM09iWvkt2nthYVFVZvhW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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