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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b466420152517ae940cc8bfff80d6df7326e7d7cd6d7af0768ec5b74b2c9f10c' 
  AND token = 'ATigJM9JAZYfJRT2A6cbciP34rac2EIgH94qiuO8+mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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