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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b73908bac01735e32911fcfa83050589be03e8836aa34e4d5a0015029bf20f4' 
  AND token = '/jJnUPJZr/bYMLRiTpxspOsVZdnYUb0dkkOyY195uuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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