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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5745b386d2f0f7f9a27f4ae14247fe9ff77a0a4cb6ddfc41e35a87f6c408de9' 
  AND token = 'TDO2r+kUpPs1dbbNKTFABkP+LYgXfPHVGPB9a3iY8JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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