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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efca4f9e5bd703b7d168672c08cd83ae58d413c7b4176894d660f592fc86e9d' 
  AND token = 'hr9XK1pyshMMwzUzdzhdFbxqhcCKqq5CQFoWgkMDl+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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