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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb129ed8b6a54237c224f0cd6d1c145b50ec9bf65ea8c38dbb3f56f1d9f6f96' 
  AND token = 'pXOF60PJL28Zh55AVN2MpvBgM0pFNykv7lp+cs0S7bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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