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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7670d3228437024cd001308d92d460a62ac81138b4c6da5e94b4196868955cc9' 
  AND token = 'TRYoO2H4zC+A/BJ03sOIPcA2wPCEEJVTcQD+7FB71SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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