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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f10a627399c275f4e0876f576096414bd5bb9bbafd046f660e7e01bfadc016f' 
  AND token = 'x+RAGBF9pIle9nZ1pDv/waUVzZtxcTAZPTTxRnx3a9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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