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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'accfd2f8e6a8fecdc5a0e45bdd0e83b1cf241fe814976c0a7e26e8b376a3f71f' 
  AND token = 'x1Tcx9KGyibVhiIV0MiyVZ5Oi1Hufyg60FNh85bSreg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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