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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbd4b88611f4d2719cabc24813419e479dcb440847af35829e485b4cd25d776' 
  AND token = 'SnYLYzLYmt4HbiEe6kZ7PTgNKhotKRN2ewPTetA57BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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