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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947bf976e4df8615aa19b2f46a122d2d0665cace63e4fd9e2be1ec0abfa13cc3' 
  AND token = 'yNOd/gfNdN2TZu0Yg0VJ5NEwzpucYH+troxQN75f93I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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