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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f31b51f68991e58ee1ccd5e1be6bd3ceb52d6ea34dccddb437061096b717c41' 
  AND token = 'R7HvR6dUL2PabMsnxn2FUl1yB9V8b1W4bbquWij1m+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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