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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8854bf8d1ba81f076e6b091e71545c9c68b203948e2bc6c9a2bddb9c421d4e31' 
  AND token = 'SnuPsMQb1S0e7GhDmgUcux6EvQtl8f4FamnDD9/htVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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