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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfba784b97eed17b32f921ad75e7dafce97d7e7b88e1ce46e2aa54da2ae4a9f7' 
  AND token = 'oi6yUsUSb1gEJ+coCU6qzObdojdSbY8Ky16XPU0TTW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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