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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a159247f82cdec7fba53b0ead19221f2824a42561c2c7051aed8d804795f0f' 
  AND token = 'QJfBdzxq4QYM6btoLJjzq8PbX5xHiHIiahgaSLbCU3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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