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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b52aa8a8e2e70a817b383001b9c5039247994356b9853bd58f5ec57b7b89fd' 
  AND token = 'fiDSQQr6xZDyVHj3FtWwj+c+xTt8n7RNnd8dxYRDIco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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