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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3313e4f282a9c5c1f42340b376d69e6de62dc1e3624ba8f6c5dccc9d02a88ec' 
  AND token = 'l3Al8bwWWpAVOoFbdPMGjPrOhEy7Psf9dEx4QN97GUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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