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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12e500df8661139a50b6b57ce1224dd3810bcbf58aa333b99172945a059d494' 
  AND token = '15om9sHcFF6HC+GP+xDHceOAttmA/r/dOdC8ISwFmGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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