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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e433d7bf65cf296d8976e6316cc7ae4174db93bb80997ee6226f825f530f4d0' 
  AND token = 'H5kbN+arjqsrlo5sPcxrGHB2QALYx4lAq8GnQzywqew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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