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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da5d804e94f261b6c7b53c6c713a3d0a3e4cdb885ebc394d830e547235b5dc89' 
  AND token = 'fNNQXOFYyuF5jBxdZFRXvIerJZsc9qXh7rCf6ZA2+28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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