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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e77b41c688f9c4bd99c4df3b59fb4fb4b66818bdb3143361212b40b1f1ef8e74' 
  AND token = 'qo8HzkEUidyq5MaecvLLIE2Q7Sf5LL5m9dMny7EciME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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