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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00b1617c8c53693d872fdccbc7753ec73a56a9b1bc7f09f47a761d8172405bd5' 
  AND token = 'Za/LCtx4hMgRtJphsTG8XYxlGEfIcpF/zZTOiF58/Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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