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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7fb88fb88b96ce1d9d53e9e40c4c80fb607e20a88d5100c0d4487c49293dfe' 
  AND token = 'GzGqDj2kWGQ6OY/cmfGxKX1LQ/O1CXwj6/zlyXInAzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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