SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e091c2b6db4ec03f38b66c45fe37f37fe73b960778bd2cad46dc93dfe5d414d4' 
  AND token = 'R+hjqtSkBC8FfbBFrp3+RaGPJLCOzS0OzgAhaGoKWo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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