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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320c2d3fa090c42064a38a772e2ea84fc136401b607f03af9bee6c8a3ecf1fde' 
  AND token = '2CNejQ6DmXh4mtzTg37o8yRZzW6N9/Gct0rVyq8oDWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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