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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599fb6e1cc9f8af8688ca72e0c8ba7a44c4067a5a4fb0a9439682b74319b878e' 
  AND token = 'u9j7MWWQgb+SOUjK/fJKcnCA7j+mZf5lfjxGcQRFrqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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