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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff79b3f75b1f5ff218e3ba1ad9275f21a36861e0e12e58751db1a32cb95849b4' 
  AND token = 'acb4AoIbfcI1/rj9WHaOhC8NgEU4lM79dLiMspBs/dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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