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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939b6f4ba1b157bbfc10acc79db17048b3d990a73e80a0d881cbf32dc2c340fb' 
  AND token = '5eDHBA3PRdRzHG3llsk9JP114QbfSgMvKgB7X2dTP9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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