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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634269c44c5620b2f47475481c1eb06cd189eb3a51706bdc80e28e9229ea6f25' 
  AND token = 'XvcNFYI0O0oQ0zC3TyUsQg66N0CDLIg8RTg7sCmnuNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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