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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3a3b6ac5af5c43eb55f674053e43dc12f4186a2f04f9ef708cd4e7b5f0c9f9' 
  AND token = 'BdE6YMlk4JWPCwjbTtFSNvD3mU8J8rRyyiS+YZ83OOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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