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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98dbaf226ebea5799f54cf2981f23b3c6c7366beec80f5b5217e42d137a41d3c' 
  AND token = '9+IPkNMMq6yi3nlHQhA3lwPCcz2KGLySCOBazkWS71U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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