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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33a289c633b96d79b13c2a631aa79a8115e3c19fccb79aa125603343fceb50e4' 
  AND token = 'roVX/XpOcFLxGocQn7jkMIMoGY26KY7hIMfx5lgqmY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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