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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de5e2003254135d019df67443f1a92a4822233c0f1bb03b502d582db259fe66' 
  AND token = 'EC4e2dQqJZ9dJFKLZSQ8rYI7Qrbto6WNmDnbV3vH4xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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