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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4517140cdf29726b4fa7116c60e5a13ba593207d3f6ff3bc8cc5dd47a55275a9' 
  AND token = 'K/o5XBCiTi8ivxax272+3m5lOCFZ3GNLaV/Jet6wuyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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