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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3cc3dee3451ef11e22deeb817f5addea89dc487bf955b052c26d9cd45c2e139' 
  AND token = 'La1rg7Hlrzhdx605eBg+pNAjgydUXEQwrjsiNdVKIs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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